-er -up c-- ccc cce cco ccp ccr ccs ccu ccx ce- cec cee ceo cep cer ces ceu cex co- coc coe coo cop cor cos cou cox cpc cpe cpo cpp cpr cps cpu cpx crc cre cro crp crr crs cru crx csc cse cso csp csr css csu csx cuc cue cuo cup cur cus cuu cxc cxo cxp cxr cxs cxx ec- ecc ece eco ecr ecs ecu ecx eec eee eeo eep eer ees eex eo- eoc eoe eoo eop eor eos eou ep- epc epe epo epp epr eps epu epx erc ere ero erp err ers eru es- esc ese eso esp esr ess esu esx eu- euc eue eup eur eus eux ex- exc exe exo exp exr exs exu exx oc- occ oco ocp ocr ocs ocu ocx oec oee oeo oep oer oes oex oo- ooc ooo oop oor oos oox op- opc ope opo opp opr ops opx or- orc ore oro orp orr ors oru orx os- osc ose oso osp osr oss osu osx ou- ouc oue ouo oup our ous ox- oxc oxo oxx p-p pcc pce pco pcp pcr pcs pcu pcx pec pee peo pep per pes peu pex poc poe poo pop por pos pou pox ppc ppe ppo ppp ppr pps ppu ppx prc pre pro prp prr prs pru prx ps- psc pse pso psp psr pss psu psx puc pue pup pur pus puu pxc pxe pxr pxs rcc rce rco rcp rcr rcs rcu rcx re- rec ree reo rep rer res reu rex roc roe roo rop ror ros rou rox rpc rpe rpo rpp rpr rps rpu rpx rrc rrp rrr rrs rru rsc rse rso rsp rsr rss rsu rsx ruc rue ruo rup rur rus ruu rux rxp rxr rxs scc sce sco scp scr scs scu scx se- sec see seo sep ser ses seu sex soc soe soo sop sor sos sou sox spc spe spo spp spr sps spu spx sr- src sre sro srp srr srs srx ss- ssc sse sso ssp ssr sss ssu ssx suc sue suo sup sur sus suu sux sxc sxs sxu ucc uce uco ucp ucr ucs ucu uec uee uep uer ues uoc uoe uoo uop uor uos uox up- upc upe upo upp upr ups upu upx ur- urc ure uro urp urr urs uru urx usc use uso usp usr uss usu usx uuc uue uur uus uuu uxc uxo uxr uxu xcp xcr xcx xee xep xer xes xeu xex xoc xoo xop xor xos xox xpc xpe xpo xpp xps xrc xrx xsc xsp xss xue xup xus xxo xxp xxx